Tranny and differential fluid synthetic,change out

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Nov 20, 2004 | 01:01 PM

coobie

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From: michigan

Tranny and differential fluid synthetic,change out

I know this question has been asked before,my truck is coming up to change the diffs and the tranny fluids(15,000 miles).What are you guys running as far as the synthetics go.I am leaning towards the amsoil products.Thanks for any Info.coobie

Nov 20, 2004 | 01:58 PM

CTDinMT

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From: Southern Utah

I have Mobile1 75-140 in the diffs right now, but it's too cold for that oil here in AK, so this weekend I am putting Amsoil 75-90 in. -Steve

Nov 20, 2004 | 02:10 PM

SuperGewl

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From: Beaverton, Oregon

AMSOIL 75W-90

Nov 20, 2004 | 07:22 PM

Nevada

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From: Logan, Utah

Another Mobil 1 user. You will not be "changing out" your differentials to synthetic, the factory fill is synthetic. Gear oil smells bad, but whatever the factory fill is smells really bad and has an unusual grey color to it.